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Counties with the Highest Radon Potential in Wyoming

The top 23 of 23 Wyoming counties on GIS Map, ranked by EPA radon zone, where zone 1 carries the highest predicted indoor radon potential and zone 3 the lowest.

#CountyEPA radon zone
1Platte County
2
2Weston County
2
3Albany County
1
4Big Horn County
1
5Campbell County
1
6Carbon County
1
7Converse County
1
8Crook County
1
9Fremont County
1
10Goshen County
1
11Hot Springs County
1
12Johnson County
1
13Laramie County
1
14Lincoln County
1
15Natrona County
1
16Niobrara County
1
17Park County
1
18Sheridan County
1
19Sublette County
1
20Sweetwater County
1
21Teton County
1
22Uinta County
1
23Washakie County
1

Source: EPA Map of Radon Zones (September 2025). All counties with data are ranked. Estimates carry margins of error.

Citing this page: GIS Map, “Counties with the Highest Radon Potential in Wyoming”, https://gismap.land/rankings/wyoming/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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